package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryDao categoryDao;
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成父子的树形结构
 
        //2.1找到所有的一级分类

        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity)->{
            return categoryEntity.getParentCid()==0;
        }).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null? 0:menu1.getSort() )- (menu2.getSort()==null? 0:menu2.getSort() );
        }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前要删除的菜单，是否被别的地方引用
        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> path = new ArrayList<>();
        List<Long> parentpath =findParentPath(path,catelogId);
        Collections.reverse(parentpath);
        return  (Long[])parentpath.toArray(new Long[parentpath.size()]);
    }
/**
 * 级联更新所有关联数据
 * */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
            this.updateById(category);
            categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private List<Long> findParentPath( List<Long> res, Long catelogId){
        CategoryEntity categoryEntity =   this.getById(catelogId);
        res.add(catelogId);
        if(!(categoryEntity.getParentCid() == 0)){
            findParentPath(res,categoryEntity.getParentCid());
        }
            return res;

    }
    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children  = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1.找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2.菜单的排序
            return (menu1.getSort()==null? 0:menu1.getSort() )- (menu2.getSort()==null? 0:menu2.getSort() );
        }).collect(Collectors.toList());
        return children;
    }

}